Student or Learner
boy- how to go about this plan.
his friend- thats you know better.
Is the expression 'you know better' correct to mean that the boy considers that his friend has better idea about how to go about this plan? colloquially we use You know better than I do but is the above stated expression also possible?
The first one could be:
How should we go about this?
What's the plan?
What do we execute this plan?
How should we do this?
The second one needs to be "You [would/should/-] know better than I [would/do/-].
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.